Dictionary:Crust

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The outermost shell of the Earth; the portion above the Moho. The crust has a P-wave velocity that is usually <7 km/s and a mean density of 2.8 to 2.9 g/cm3. Continental crust (acidic crust or sial) is granitic to gabbroic; oceanic crust (basic crust or sima) is basaltic. See Figure E-1.